" 140."sum_(r=1)^(n)(1)/((ar+b)(ar+a+b))" The value of "

Find the sum sum_(r=1)^(n)(1)/((ar+b)(ar+a+b))

Find the sum :sum_(r=1)^(n)(1)/((ar+b)(ar+a+b))

Let a_r=r(.^7C_r),b_r=(7-r)(.^7C_r) and A_r=[(a_r,0),(0,b_r)] . If A=sum_(r=0)^7 A_r=[(a,0),(0,b)] , then find the value of a+b .

Let a_r=r(.^7C_r),b_r=(7-r)(.^7C_r) and A_r=[(a_r,0),(0,b_r)] . If A=sum_(r=0)^7 A_r=[(a,0),(0,b)] , then find the value of a+b .

The value of sum_(r=0)^(n) (a+r+ar) (-a)^( r) is equal to

The value of sum_(r=1)^(n) log ((a^(r ))/( b^(r-1))) is :

The value of sum_(r=0)^(n)(a+r+ar)(-a)^(r) is equal to (-1)^(n)[(n+1)a^(n+1)-a]b(-1)^(n)(n+1)a^(n+1) c.(-1)^(n)((n+2)a^(n+1))/(2)d(-1)^(n)(na^(n))/(2)

If sum_(r=1)^(n) a_(r) = (n (n+1)(n+2) )/( 6) AA n ge 1 , then Lt_(n to oo) sum_(r=1)^(n) (1)/( a_r)=

Find the value of Sigma_(r=1)^(n) (a+r+ar)(-a)^r is equal to

The value of Sigma_(r=1)^(n) (a+r+ar)(-a)^r is equal to